I built my own fEARful 1515/66, and have been using that one at gigs.
The LDS one has a Ron Anchak built proper fEARful spec crossover. LDS crossover available if you prefer. Don builds the box around 5-10 % smaller but it rumbles.

I added up the cost of the drivers alone, (3015lfs and 6nm410 mids) on speakerhardware.com (almost 800.00) and that does not cover the crossover, box build, tilt back handles and casters side D handles, combo speakon 1/4" (2),corners etc.
I don't know what LDS will charge for this now. Don gets good prices on the drivers I think. Plus I added high impact skid rails on the back. Just filled and sanded the dings and put new Duratex coat everywhere but the bottom. The bottom is protected by a bunch of heavy duty rubber feet.
This will be at the SF GTG (Boulder Creek), if it lasts that long. Don't think so though.
850.00 Local sale only! Try to find a nEARful fEARful for less than a dollar a watt!

I took out the attenuator for the mids but still have it and it will mount on the jackplate where it originally resided. You just have to be handy enough to hook it up. fEARful builders use switches now too. I like the 6nm mids full bore. And attenuators can sometimes fail. Even Don told me they sometimes do.

"Even though I'm not a big fan of the fEARful tonal footprint, it is pretty hard for any cab I'm aware of to keep up with a 1515/66 with a thousand watts pumping into it regarding true low end in a rock context. Even the 15/6 will give you shockingly full and loud performance".
Stole this quote from another thread.
Basically the deal in a nutshell, is the most powerful low end independent of PA support, and separate aggressive midrange speakers for the rest of the notes. You can add to the crossover by buying the part(s) from speakerhardware.com, and add the tweeter in. I am a finger style player and have no need of a tweeter.